body{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    margin: 0px;
    padding: 0px;
}

ul {
    list-style: none;
    margin: 0px;
    padding: 0px;
}
#app {
    width: 100%;
    height: 100%;
    padding-top: 40px;
}